To have a deep understanding of LEDs, we first need to understand some basic knowledge of LEDs, and secondly, we must understand the performance indicators of LEDs, because LED performance indicators are the core part of the entire LED. The LED performance indicators are divided into 12 keywords and analyzed in detail.
12 LED important performance indicators
(1) LED color: The color of LED is a very important indicator. Every LED related lighting product must be marked. At present, the color of LED mainly includes red, green, blue, cyan, yellow, white, warm white. Amber and so on. This parameter must not be forgotten when we design and order (especially for beginners). Because of the different colors, the related parameters also vary greatly.
(B) LED current: LED forward limit (IF) current is more than 20MA, and LED light decay current can not be greater than IF / 3, about 15MA and 18MA. The luminous intensity of the LED is only proportional to the IF within a certain range. When the IF is 20MA, the enhancement of the brightness cannot be separated by the inner eye. Therefore, the operating current of the LED is generally selected to be around 17-19MA. The previous section is for LEDs between ordinary low-power LEDs (0.04-0.08W), except for some piranha LEDs (some rated at around 40MA).
In addition to the continuous development of technology, high-power LEDs are also constantly appearing such as 0.5W LED (IF=150MA), 1W LED (IF=350MA), 3W LED (IF=750MA) and many more specifications, I am not one. As soon as you introduce it, you can check the LED manual yourself.
(3) LED voltage: Generally speaking, the LED is a forward voltage, that is, the positive pole of the LED is connected to the positive pole of the power supply, and the negative pole is connected to the negative pole of the power supply. The voltage is related to the color. The voltage of red, yellow and yellow green is between 1.8 and 2.4V. The voltages of white, blue and emerald green are between 3.0 and 3.6v. Here, I would like to remind you that there will be some differences in the LED voltage produced in the same batch. According to the manufacturer's specifications, when the external temperature rises, VF will drop. (LED negative temperature coefficient characteristics)
(4) Reverse voltage of LED VRm: Maximum reverse voltage allowed to increase. Above the value, the LED may be damaged by breakdown.
(5) Color temperature of LED: It is expressed by absolute temperature K, which is a standard black body heating. When the temperature rises to a certain extent, the color begins to change from deep red to light red-orange-white-blue, and a certain light source and black body When the colors are the same, the absolute temperature of the black body at that time is called the color temperature of the light source.
Since the correlated color temperature is actually the black body radiation approaching the light source color, the evaluation value of the light source color performance is not an accurate color contrast, so the two light sources with the same color temperature value may still be in the light color appearance. There are some differences. Color temperature alone cannot understand the color rendering ability of the light source to the object, or how the color of the object is reproduced under the light source.
Correlated color temperature for different light source environments
In addition, the color temperature of the light source is different, and the light color is different:
- The color temperature has a warm feeling below 3000k, reaching a steady atmosphere;
- The color temperature is between 3000k and 5000k as the intermediate color temperature, which has a refreshing feeling;
- The color temperature is above 5000k and it has a cold feeling.
(6) Luminous intensity (I, Intensity): unit candela, ie cd. The luminous flux emitted by the light source in a unit solid angle in a given direction is defined as the light intensity (degree) of the light source in that direction, the luminous intensity is for the point source, or the size of the illuminant is compared with the illumination distance. Small occasions. This amount is indicative of the ability of the illuminator to converge in space. It can be said that the luminous intensity describes how much the light source is "bright" because it is a common description of the optical power and convergence ability. The greater the luminous intensity, the brighter the light source appears, and the brighter the object is illuminated by the light source under the same conditions. Therefore, this parameter was used earlier for the description of the flashlight.
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